Edge transport and turbulence reduction with lithium coated plasma facing components in the National Spherical Torus Experiment a)
Edge transport and turbulence reduction with lithium coated plasma facing components in the National Spherical Torus Experiment a)
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DOI：
10.1063/1.3592519
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发表时间：
2011-05
影响因子：
2.2
通讯作者：
J. Canik;R. Maingi;S. Kubota;Y. Ren;R. Bell;J. Callen;W. Guttenfelder;H. Kugel;B. LeBlanc
中科院分区：
文献类型：
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作者：
J. Canik;R. Maingi;S. Kubota;Y. Ren;R. Bell;J. Callen;W. Guttenfelder;H. Kugel;B. LeBlanc
用锂涂覆面向等离子体的组件（PFC）改善了能量约束并消除了国家球形环实验中的ELM，后者是由于密度和压力分布的松弛，其降低了剥离-膨胀模式的驱动力。不含锂和含锂放电的二维解释性传输模型表明，PFC再循环系数从R = 0.98降低到R = 0.90，才能与含锂涂层的Dα排放下降相匹配。观察到边缘势垒区的加宽，显示出降低的输运系数，其中D和χe从0.8 <N < 0.93下降了约75%，以匹配锂涂层的轮廓弛豫。湍流测量使用的边缘反射计系统以及高k微波散射显示与锂涂层的密度波动减少。这些传输变化允许实现非常宽的通道，相对于参考放电，宽度增加了100%。
The coating of plasma facing components (PFCs) with lithium improves energy confinement and eliminates ELMs in the National Spherical Torus Experiment, the latter due to a relaxation of the density and pressure profiles that reduces the drive for peeling-ballooning modes. 2-D interpretive transport modeling of discharges without and with lithium shows that a reduction in the PFC recycling coefficient from R ∼ 0.98 to R ∼ 0.90 is required to match the drop in Dα emission with lithium coatings. A broadening of the edge barrier region showing reduced transport coefficients is observed, with a ∼75% drop of the D and χe from 0.8 < ψN < 0.93 needed to match the profile relaxation with lithium coatings. Turbulence measurements using an edge reflectometry system as well as high-k microwave scattering show a decrease in density fluctuations with lithium coatings. These transport changes allow the realization of very wide pedestals, with a ∼100% width increase relative to the reference discharges.